Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece
and leave with the element ID LEGO asks for, or a link to buy the part.
LEGO's request form asks for the set number (8904) and each piece's element ID, both listed above.
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Piece checklist
Large Buildable Figures
14 pieces
Large Figure Skeletal, Torso with Beam, 2 Ball Joints, and 7 Tooth Half GearDark TanPart 47306Element 4287106×1
Large Figure Skeletal, Torso with 2 Ball Joints (Piraka)Pearl Dark GrayPart 53564Element 4284539×1
Large Figure Weapon, Piraka Seismic Pickaxe (Avak)Pearl Dark GrayPart 53578Element 4288103×1
Large Figure Foot, Piraka MechanicalReddish BrownPart 53568Element 4287444×2
Large Figure Limb Cover, Upper Leg Section (Piraka)Reddish BrownPart 53566Element 4287110×2
Large Figure Mask Piraka, with Flexible Spine and Arm Covers, AvakReddish BrownPart 53580Element 4279759×1
Large Figure Skeletal, Limb, Plated with 2 Ball Joints (Piraka)Reddish BrownPart 53574Element 4287111×2
Large Figure Skeletal, Limb, with 2 Ball Joints (Piraka)Reddish BrownPart 53563Element 4287109×1
Large Figure Skeletal, Limb, with 2 Ball Joints, and Hole (Toa Metru)Reddish BrownPart 47311Element 4218472×1
Large Figure Head Connector Block Eye/Brain Stalk (Piraka) - Light-UpTrans-Neon OrangePart 53500Element 4288205×1
Large Figure Head (Piraka) with Glow In Dark Teeth PrintWhitePart 53565pr0001Element 4290480×1
Technic Connectors
10 pieces
Technic Axle Connector 2 x 3 with Ball Socket, Open SidesDark TanPart 32174Element 4287107×5
Technic Axle and Pin Connector 2 x 5 with Two Ball Joint SocketsDark TanPart 47296Element 4287104×2
Technic Axle and Pin Connector 2 x 7 with Two Ball Joint SocketsDark TanPart 50898Element 4287105×2
Technic Axle and Pin Connector Angled #1Light Bluish GrayPart 32013Element 6296859 or 4211550×1
Technic Pins
8 pieces
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]BlackPart 32054Element 4140801 or 4107742×1
Technic Pin with Friction Ridges Lengthwise and Center SlotsBlackPart 2780Element 4121715 or 278026×6
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×1
Projectiles / Launchers
5 pieces
Projectile, Large Figure Weapon, Zamor Sphere / Ball with Marbled Trans-Bright Green PatternBright GreenPart 54821pat0002Element 4296080×4
Large Figure Weapon, Zamor Sphere LauncherPearl Dark GrayPart 54271Element 4288099×1
Technic Axles
3 pieces
Technic Axle 2 NotchedBlackPart 32062Element 4109810 or 3206226×1
Technic Axle 4BlackPart 3705Element 370526×1
Technic Axle 5.5 with Stop [Rounded Short End]Dark Bluish GrayPart 59426Element 4508553×1
Tubes and Hoses
1 piece
Axle Hose, Soft 11LDark Bluish GrayPart 32199Element 4292000 or 4210650×1
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